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A. BUTTNER APPARATUS FOR ADJUSTING AND STOPPING THE PRINTING IN AUTOMATIC PLATEN PRINTING PRESSES Filed May 22 1955 2 Sheets-Sheet 1 Oct. 22, 19-35.

Javenzor Oct. 22, 1935. A, BUTTNER 2,018,602

APPARATUS FOR ADJUSTING AND STOPPING THE PRINTING IN AUTOMATIC PLATEN PRINTING PRESSES Filed May 22, 1933 2 Sheets-Sheet 2 Jill/enter Patented Oct. 22, 1935 APPARATUS FOR ADJUSTING AND STOP- PING THE PRINTING IN AUTOMATIC PLATEN PRINTING PRESSES Artur Biittner, Heidelberg, Germany, assignor to Schnellpressenfabrik Aktiengesellschaft Heidelberg, Heidelberg, Germany Application May 22, 1933, Serial No. 672,313

In Germany June 4, 1932 6 Claims. (01. 101306) This invention relates to apparatus for adjusting and stopping the printing in automatic platen printing presses of the kind in which the platen is actuated by means of a toggle mechanism.

In platen printing presses of the kind referred to, it has been proposed for the purpose of starting and stopping the printing, to construct the pivot of the toggle mechanism by means of which the latter is connected to the frameof the press in the form of a rotatable eccentric, by the rotation of which the pivot is displaced and the extent of the rocking movement of the platen is varied to suit varying thicknesses of paper or material to be printed on or the depth of impression to be made, by which means also the printing can be started and stopped by sufficient displacement of the pivot by rotation of the eccentric. In this arrangement, the entire operating pressure acts on the eccentric so that regulating of the impression pressure can only be effected in those positions of the toggle mechanism in which the latter is relieved of the impression pressure. In the case of very high working speeds, it is therefore very diflicult to obtain exact adjustments of the impression.

The present invention has for its object to overcome these drawbacks and with this object in View the invention consists substantially in this that the stationary pivot of the toggle mechanism is displaoeable in a straight line by means of a screw threaded adjusting member (worm or the like) This screw threaded member, which is preferably in the form of an irreversible worm, relieves the adjusting means from the considerable compression forces so that adjustment of the toggle mechanism is possible even during the actual printing operation without the expenditure of a large amount of force and it is consequently easy to effect fine adjustment by displacing the fulcrum pivot of the toggle mechanism. The screw threaded adjusting member can be turned inside a nut by means of a pivotally mounted hand lever arranged at the front side of the printing press. In order to obtain very exact adjustment of the impression pressure and enable the hand lever to be secured in the adjusted position, the hand lever may be connected to a locking member guided so as to I travel in a straight line, which locking member may be displaced by means of a screw spindle.

The straight line displacement of the stationary pivot of the toggle mechanism enables a shear piece to be interposed between the worm or the like and the bearing of the toggle mechequipped with the device according to the in- 10 vention;

Figure 2 shows a part of the device in longitudinal section on a larger scale; and

Figure 3 shows a partial front view of the platen press according to Figure 1, likewise on 15 the larger scale.

Fig. 4 is a vertical section taken on line II of Fig. 3.

In the pedestal I of the press, which carries a frame 2 for the reception of the printing bed, 20-.

the platen 3 swings about a pivot 4. The driving of the platen 3 is effected from the main shaft 5, upon which a crank 6 is secured. To the latter is attached a connecting rod I, the other end of which is connected with the central joint pin B of a toggle lever 9,, I0. The arm 9 of this toggle lever is pivoted to the lower end of the platen 3, and the arm-I93 is connected by a pivot H with a displaoeable bearing I2. On the platen 3 are rotatably arranged grippers or fingers [3,30

which receive sheets to be printed from a feeding pile located upon a table I4, and convey them, after the printing, on to a delivery pile, likewise arranged upon'the table I4.

The stoppage of printing and the regulating of the pressure are effected by displacing the bearing I2. For this purpose the bearing I2 is provided with a sliding pin or stem I5 (Figure 2), which is displaoeable in a bush I6 fixed in the base I, and terminates in a journal I'I. Upon 40 the latter is rotatable a worm or screw-threaded sleeve I8, which bears at one end against a shearing ring I9 and at the other end against an abutment ring 20. The bush I6 is provided with a corresponding internal screw thread, in which the screw I8, as it rotates, can move to the left or right, as a result of which the toggle-lever bearing I2 is displaced in one direction or the other. With the screw I8 is connected fast a lever 2|, which engages, as shown in Figures 2 and 3, by means of a lateral tappet 22, in a notch in a toothed segment 23, which is freely rotatable upon the bush I6. For the purpose of rotating this toothed segment 23 a shaft 24 is rotatably mounted in bearing blocks 25 on the side wall of the press pedestal I, and upon this shaft 24 is secured at the rear end a second toothed segment 26 meshing with the toothed segment 23, and at the front end a hand lever 21. By rock- 5 ing the latter to and fro the worm I8 is rotated and the toggle-lever bearing l 2 thereby displaced, as a result of which the position of the printing platen 3 in relation to the printing bed is changed.

On the front edge of thetable I4 is secured a 10 bearing block 28, in which is rotatably arranged a screw spindle 29 with a fine screw thread, which can be rotated by means of the knurled knob 39. Along the spindle 29 can be screwed a locking piece 3|, constructed as a nut, which can be adjusted in relation to a scale 32 secured on the bearing block 28. The hand lever 27 has an upper portion 21 which is pivotally connected with the lower portion 21 by a bolt or pin 33 and is provided with a handle 21 A bolt 34 arranged in the portion 21 of the lever engages in a groove 35 in the locking piece 3| and thereby secures the position of the lever 21 and therefore of the toggle-lever bearing I2, and thereby also secures the position of the platen 3 inrelation to the print- 25 ing surface. The part 21 with the bolt 34 is held in engaging position by a spring not shown. By rotating the knob the position of the platen, and therefore, the printing pressure, can be regulated while the machine is running. A fine ad- 30 justment of the pressure is therefore possible during operation.

If the handle 21 is tilted forwards so as to pull the pin 34 out of the groove 35, the lever 21 can be rocked into the position I (Figure 3) as a re- 35 suit of which the toggle-lever bearing l2, in the position of the parts indicated in Figure 2, is displaced to the right. The platen 3 then nolonger touches the printing bed in its swinging movement, so the printing is stopped.

During the actual printing operation the pressure acting upon the toggle lever 9, I0 is propagated through the sliding pin l5 and the shearing ring [9 to thescrew [8, which cannot overhaul, so that the parts controlling this screw are not in any way stressed, and the adjusting of the pressure, even in the case of large presses, can be effected without difficulty while the press is working.

If, during the printing operation excessive pressures occur from any cause, a projection on the sliding pin I5 shears off the internal collar (shown in Figure 2) .of the shearing ring [9, as a result of which the toggle-lever bearing l2 can yield to the right, so that the press can for the moment continue to run without risk of breakage, becausethe printing is stopped. After taking out the screw I8 a fresh shearing ring Hi can be inserted.

What I claim is:-

1. An apparatus for adjusting and stopping the printing in automatic platen printing presses having a toggle mechanism for actuating the platen, comprising, in combination with anoscillable platen carrier, a toggle lever attached atone endthereto, a bolt connected with the opposite end of the toggle lever and extending in the direction of the same; a worm connected with said bolt, a stationary, internally threaded sleeve engaged by said worm; an arm connected with the worm at the free face thereof, a projection extending forth from said arm in the direction to the toggle lever;

a toothed sector supported on the stationary sleeve and having a recess engaged by said pro 75 jection, and means for turning said sector.

2. An apparatus for adjusting and stopping the printing in automatic platen printing presses having a toggle mechanism for actuating the platen, comprising, in combination with an oscillable platen carrier, a toggle lever attached at 5 one end thereto, a bolt connected with the opposite end of the toggle lever and extending in the direction of the same; a worm connected with said bolt, a stationary, internally threaded sleeve engaged by said worm; an arm connected 10 with the worm at the free face thereof, a projection extending forth from said arm in the direction to the toggle lever a toothed sector supportedon the stationary sleeve and having a recess engaged by said projection, another sector 15 meshing with the first-mentioned sector, and a lever connected with said. other sector and situated at the front side of the machine.

3. An apparatus for adjusting and stopping the printing in automatic platen printing presses 20 having a toggle mechanism for actuating the platen, comprising, in combination with an oscillable platen carrier, a toggle lever attached at one end thereto, a bolt connected with the opposite end of the toggle lever and extending in 25 the direction of the same; a worm connected with said bolt, a stationary, internally threaded sleeve engaged by said worm; an arm connected with the worm at the free face thereof, a projection extending forth from said arm inv the 30." direction to the toggle lever; a toothed sector supported on the stationary sleeve and havinga recess engaged by said projection, another sector meshing with the first-mentioned sectorfa lever connected with said other sector and situated at the front side of the machine; a threaded spindle supported in the frame of the machine near the handle end of said lever; means for turning said spindle; a nut located on the spindle and having a lateral recess, and a mem- 05.:

her extending forth from lever handle end into said recess.

4. An apparatus for adjusting and stopping the printing in automatic platen printing presses having a toggle mechanism for actuating the platen, comprising, in combination with an oscillable platen carrier, a toggle lever attached at one end thereto, a bolt connected with the opposite end of the toggle lever and extending in the direction of the same; a worm connected with said bolt, a stationary, internally threaded sleeve engaged by said worm; an arm connected with the worm at the free face thereof, a projection extending forth from said arm in the direction to the toggle lever; a toothed sector supported on the stationary sleeve and having a recess engaged by said projection, another sector meshing with the first-said sector; a lever connected with said other sector, said lever comprising a body portion and a handle portion which is turnable at said body portion at right angles to the direction of motion of the same; a threaded spindle supported in the frame of the machine near the handle end of said lever; means for turning said spindle; a nut located on the spindle and having a lateral recess, and a member extending forth from said lever handle portion into said recess.

5. An apparatus for adjusting and stopping the printing in automatic platen printing presses 70,

having a toggle mechanism for actuating the platen, comprising, in combination with an oscillable platen carrier, a toggle lever attached at one end thereto, a bolt connected with the opposite end of the toggle lever and extending" in the direction of the same; a worm connected with said bolt, a stationary, internally threaded sleeve engaged by said worm; an arm connected with the worm at the free face thereof, a projection extending-forth from said arm in the direction to the toggle lever; a toothed sector supported on the stationary sleeve and having a recess engaged by said projection, another sector meshing with the first-mentioned sector; a lever connected with said other sector, said lever comprising a body portion and a handle portion which is turnable at said body portion at right angles to the direction of motion of the same; a threaded spindle supported in the frame of the machine near the handle end of said lever; means for turning said spindle; a nut located on the spindle and having a lateral recess, a graduated scale extending along the path of the nut, and a member extending forth from lever handle end into said recess.

6. An apparatus for adjusting and stopping the printing in automatic platen printing presses, comprising in combination a machine frame, a platen carrier oscillable in said frame, a toggle lever attached at the lower end of said platen carrier, a horizontally shiftable bolt connected with the opposite end of the toggle lever and extending in the direction of the same, a screw threaded part turnably connected with said bolt, an internally threaded sleeve firmly fixed in said machine frame and engaged by said screw threaded part, means for turning said screw threaded part, and a handle in connection with said turning means and situated at the front side of the machine, and means for locking said handle in different positions.

ARTUR BfiTrNER. 

